Continuously tuneable liquid crystal based stripline phase shifter realised in LTCC technology
Continuously tuneable liquid crystal based stripline phase shifter realised in LTCC technology
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采用 LTCC 技术实现的连续可调液晶带状线移相器
DOI：
10.1109/eumc.2015.7345999
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Jakoby
中科院分区：
文献类型：
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作者：
M. Jost;S. Strunck;A. Heunisch;A. Wiens;A. Prasetiadi;C. Weickhmann;B. Schulz;M. Quibeldey;O. Karabey;T. Rabe;R. Follmann;D. Koether;R. Jakoby
本文介绍了低温共烧陶瓷（LTCC）集成液晶（LC）移相器的设计、制造和测量。移相器的有效介电常数及其差分相移可以通过用电场定向LC指向矢来连续调谐。相移演示器设计用于约30 GHz的Ka波段频率，代表了嵌入LTCC多层结构内的填充有LC的带状线，其在具有RF能力的材料系统内提供了空间合格和密封的LC腔。该器件的总长度为37 mm，相移LC部分的长度为14.6mm。在30 GHz时，它表现出60°的差分相移，插入损耗约为6dB，导致品质因数约为10°/dB。一个优点是插入损耗几乎与LC的调谐状态无关。移相器的响应时间取决于所需的LC取向，在62 ms和37 s之间。
This work presents the design, fabrication and measurements of a low temperature cofired ceramic (LTCC) integrated liquid crystal (LC) phase shifter. The effective permittivity of the phase shifter and therefore its differential phase shift can be tuned contiuously by orienting the LC directors with electric fields. The phase-shift demonstator is designed for Ka-band frequencies around 30GHz and represents a stripline filled with LC, embedded inside an LTCC multilayer structure, which provides a space-qualified and hermetically-sealed LC cavity within an RF-capable material system. The total length of the device is 37mm while the phase shifting LC section has a length of 14.6 mm. At 30GHz it exhibits a differential phase shift of 60° with an insertion loss around 6 dB, resulting in a figure of merit around 10°/dB. An advantage is that the insertion loss is nearly indepentent of the tuning state of the LC. The response time of the phase shifter, depending on the desired LC orientation, is between 62ms and 37s.